Sample interview questions: Can you explain the concept of neutron activation analysis and its applications?
Sample answer:
Neutron Activation Analysis (NAA)
NAA is a quantitative analytical technique that utilizes the activation of target elements with neutrons. When a sample is exposed to a neutron source, some of its atoms absorb neutrons and undergo nuclear reactions, transforming into radioactive isotopes.
Principle:
- Neutrons are captured by target atoms, leading to the formation of unstable isotopes.
- The unstable isotopes then decay by emitting characteristic gamma rays.
- The energy and intensity of the gamma rays are used to identify and quantify the target elements.
Applications:
- Elemental Identification: NAA can identify and quantify trace elements in various materials, including biological samples, environmental samples, and archaeological artifacts.
- Non-Destructive Analysis: NAA is non-destructive, allowing for the analysis of valuable samples without altering them.
- High Sensitivity: NAA exhibits high sensitivity, allowing for the detection of extremely low conce… Read full answer